hundert
hundred
The cardinal number 100; ten times ten.
Das Buch hat genau hundert Seiten.
The book has exactly one hundred pages.

hundred
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hundred
The cardinal number 100; ten times ten.
Das Buch hat genau hundert Seiten.
The book has exactly one hundred pages.

When 'hundert' (hundred) is part of a larger number under one thousand, everything is written as one word. For example, '101' is written as 'hunderteins' (one hundred one) and '125' as 'hundertfünfundzwanzig' (one hundred twenty-five).
Das Ticket kostet genau hundertvierzehn Euro.
The ticket costs exactly one hundred fourteen euros.
The form 'Hunderte' (hundreds), with -e at the end, is used to express an indefinite large quantity. You then say 'Hunderte von' (hundreds of) + a plural noun.
Hunderte von Menschen warteten vor dem Stadion.
Hundreds of people were waiting in front of the stadium.
In everyday language, 'hundert' (hundred) is often not meant literally, but as an exaggeration for 'very often' or 'a lot.' The context makes it clear that no exact number is meant.
Ich habe noch hundert Dinge zu erledigen, bevor ich gehe.
I still have a hundred things to do before I leave.
much / a lot
'viel' and 'hundert' can both express a large amount. 'viel' is imprecise and is especially suitable for amounts that you are not counting exactly, or when the exact number is not important. 'hundert' is actually the exact number 100. Colloquially, however, 'hundert' can also be used as an exaggeration to mean very many. In that case, you do not always mean exactly 100. So the difference is: 'viel' stays general, while 'hundert' sounds more concrete or stronger, especially in expressions like 'hundert Fragen' (a hundred questions).

Vor der Reise hat mein Bruder noch hundert Dinge zu erledigen.
Before the trip, my brother still has a hundred things to take care of.
Nach dem Umzug hat Anna viel Arbeit in der neuen Wohnung.
After the move, Anna has a lot of work to do in the new apartment.